A robust channel equalizer for OFDM TV receivers

Author

Kang, Myoung-Soo ; Song, Woo-Jin

Author_Institution

Dept. of Electron. & Electr. Eng., Pohang Inst. of Sci. & Technol., South Korea

Volume

44

Issue

3

fYear

1998

fDate

8/1/1998 12:00:00 AM

Firstpage

1129

Lastpage

1133

Abstract

In this paper we present and analyze a nonparametric channel equalizer based on the moving average estimator. Since the OFDM system can be considered as a set of parallel Gaussian channels with different frequency gain for each subcarrier, we apply the theory of sample mean to each subcarrier by averaging the consecutive data symbols. Assuming the channel attenuations and the transmitted data symbols are constant while taking averages, this effectively removes noise and we can obtain the data symbols distorted only by the multipath channel. The proposed method does not require any a priori knowledge about the channel statistics. Furthermore, it has the performance improvement over conventional schemes even for slowly time-varying channels. We evaluate the equalizer through simulation using a 16 QAM OFDM system

Keywords

Gaussian channels; digital television; equalisers; frequency division multiplexing; multipath channels; nonparametric statistics; quadrature amplitude modulation; television receivers; time-varying channels; 16 QAM; OFDM system; TV receivers; channel attenuation; consecutive data symbols averaging; moving average estimator; multipath channel; nonparametric channel equalizer; parallel Gaussian channels; robust channel equalizer; sample mean theory; simulation; slowly time-varying channels; subcarrier; transmitted data symbols; Attenuation; Equalizers; Gaussian channels; Multipath channels; OFDM; Quadrature amplitude modulation; Robustness; Statistics; TV receivers; Time-varying channels;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.713245

Filename

713245